Because it will make the pasta stick together. You could put some oil in and stir after a few minutes, and use a vented lid. You also may need to turn your power level down a bit if you have an E rated microwave. I also break straight spaghetti into a 3rd of the length or half. read more
Cooking pasta in the microwave can be done in under 20 minutes with either a heatproof cup or bowl or a microwave pasta cooker. You will also need a measuring cup, a colander, up to 5 cups of your choice of pasta and up to six quarts of water (to make four pasta servings). read more
Get a microwave safe bowl and add 1/2 cup to 1 cup (I went with 1 cup because I’m a good eater) of pasta of your choice. Add water to the bowl so the pasta is a couple of inches deep. Remember that the pasta will grow in size, so be sure to have enough water. read more